Casting machine



a. S'TRUBLE Sept. 1, 1925.

CASTING MACHINE Filed May 21, 1925 EMT DR nimn surname, or"

Pei-EM OFFICE.

PQR'IFLAND, GREGON.

GASTINGi MACHINE.

Application filed Mayv 21 T 0 all whom it may concern.

Be it known that BURR STRUBLE, a citizen of the United States, residing atPOitland county of Mnltnomah, State of Oregon, haveinvented certain new and. iiseful Improvements in Casting .Machines oi; which the following is aspecification, f My invention relates to castin 1 machines in general and particularly-tor sntaisast, ing machines, the object being toi provide' dentists with: a cheap,.simple and convenient casting machine, to provide means whereby the maximum pressure of air upon then'i'old may be predetermined by a setting of the; machine parts, toprovide a storage chamber intermediate the air pnmp. and the mold whereby compressed air' atsaid maniiniini pressure may be applied to the mold and allowed to he gradually reduced to atmos pheric pressure and to provide Q'Vfed gasket means of making] an air tight oint between said storage chamher' and the mold; I accomplish the above'ohjectsy and other desirable results that will hereinafter appear, by meansof the construction illustrated in the accompanying drawing,, which' a part of this application for Letters-Patent; like characters of refsrenoeindioating like parts throughout the several views thereof, and in which: f "I Fig. 1 is a side elevation of my device. Fig. 2 is a sectional elevation thereof. Fi .3 is a plan view" thereon with the opsratin pants swiingto oneside. V

Fi 4 isv a plan view thereof with the operating parts in operating position. i Fig; 5 is a section upon line 5-5 of Fig;

Fig. 6 is a perspective view of a. portion otths standard; A

Fig. 7 is a perspectivev view f thoswing ing ai-in. 1

Fi 8 is a plan view of one of the retainingringsi y In sneralni devise oonsists'oi? inold receiving base having a standard arising therefrom, a swinging' arin' moiinted upon said standard, a vertically movable pinnp cylinder mounted in said arm, a piston with insaidc lindsi, astora o chamber upon said piston, anda h sadnp n saidstorage chamber adapted to contactwi'th the mold in an air tight manner. l In the base 9 of my device IprO ide'a series of concentric counterhores lo adapted to receive various size sf moms. Inl i-g. 2 is shown the smallest size of mold 11',

1923. semi no. 640,484.

in F'i'g. I is lshow'n an intermediate size of mold 12. The molds are of the nsual form of dental mold, as show in. Fig. 2, and

need no description herein. -A'ri sing from the case 9 1s a standard. 13 seciirely 'fixedg within the base, and provided near the topthereof with a fixed collar 14;. Upon the.

Iipper portio of said standard above the collar 14, and resting upon said colianis rotatably mounted a swinging arm 15 with a hub lae at the extremity thereof, said hi'ib bsing' dapted to be swung about the standard 13 iintilit assumes a position axiahy aboveths oounterbo'rss 10 in the base, as hown in Figs; 1, 2 a'nd'. L

Freely onnted both Vertically and rot atably within said hub 15 is a pump cylinder 16, opsn at its lower end'and closed at its upper end, witha hand knob 17 mounted nponfthsuppsr end thereof, "as shownin Figs. land 2. As will hereinafter appear 7 itis desirable that said piimjo cylinder should rotate very; freelywithin'said huh 15" but should present some frictional resistan s to vertical ovemsntgtheroin; and this; I as ooii plis h by providin rings 18- dispos d within an annular slot 19in saidhub, said rin s gri pin 'Lths pump c linder with stiii'lcient forts to iovid the desire -hid tional resistance to verticalnoveinent there of, but rotating freely within the groove 19 and'thnspresentjing 0 resistance to rotation ofthepiiinp cylinder.

Within the pump cylinder is I' provide 30 thsnsiial' piston '20 with pump washer 21, shown in jg. 2, and extending wa d from said piston, andints ral with, is a oylindrioallsto ags ohambsr '22 terminating; inia hoadas, which head" is oonnterhored to receive an annular gasketv or washer 24, shown in Fig. Said washer 24; contacts" with the mold '11 when the chamber 221's i'n'its 'lowerniost position, and is adapted to make an air tightconnec' ti'on between saidiohamh r andjths mold;

Prefer bly said washer is;:construsted oi cardboard, and issjoalzed in water before using, and itis "on-obi: the features of my invention that such soaking is-o'asiiy ace'onr plishsd without 'r'sinovingths washer iron; the head 23, by simply slipping the arm 1'5 together with the pump cylinder 16 and chamber '22 from the standard I3 and dipping the head 23' in water.

To locate the swin ing i h eiractly axially above the mold "ii I provide a stop ber 22;

pin 25- inthe coll'ar l l to contact with said arm when" the latter is in operating pos tion, and to secure the arm in said posltion I provide thereininspringcatch-26 the end of which catch is adapted to enter a hole 27 in said collar 14:.

To prevent the chamber 22 being completely Withdrawn fromthe-pump *cylinder 16 I provide Within said cylinder a rod 28 extending downward through the piston; 20 and terminating withinthechamber 22 with a nutted end 29, the nut'o-f which will contact" witlrthe piston 20 to, retain thejchain berj within'the pum'p cylinderi' The orifice in" the piston through which rod28 passes ismade larger than'said rod to "admit air irom" the pump "cylinder into the ch'ar 'ri' To operate the device the arm l' is swung tofone 'side'as shown in Fig. 3, fandthe ni'oldf is placed in position within the "coun'terbore The'pump"cylinder, chamben'and' he'ad23 are raised as a unit by sliding the'pump cylinder withinthe'hubjl5 into position shown bytdotted lines,30 in'Fig."2.'iiThe chamber 22 is made a "sufficiently tight. fit within the pump cylinder 16 "to act as a'unit therewith whenbeing thus 'raised".tl1ereby.' f ,Thearin' :'is the'uswung back int-o its position over the 'mold"1I,"and the pump cylinder, f'chani'bena'njd' head '23 depressed until the washer 24:"contacts with the mold 11, as shown in Fig.2, the c11amber22'hav ing previously [been partially withdrawn from the pump cylinder, as also shown in Fig. 2. 'A'further depression'otthe pump cylinder will result in compressing the" 'air therein and causing V the Icoi'npressedair to enterthe chamber byway ofth'e orifice in the piston'through which the'rod'28 passes. i It is obvious that bythis construction the piston cannotbe' broughtinto such close juxtaposition" with they mold as to expel thereupon all the compressed "air Within the device, but "on'the contrary "simply compresses t'he airwith'in the chamber22, which thereupon is slowly 'dissip'ated through the mold until the pressure withinthe chamber 22 returns to thatof the atmosphere; This is one of the princip'alfeatures'of my invention, since it'has'beenfound detrimen ml to the-casting process to bri'n'g'the piston into'close juxtaposition with the mold and thus subject the mold to a" momentarily high pressure whichq'u'ickly is reduced it atniospheric pressure. It has been found'that the. pressure should'be raised only to a predetermined value, and then allowed to dissi: pate slowly through anappreciable' interval of time until it isag in atat ospherie pressure, thus allowing thecasting suchin terval of time in which to become solidified before'all pressure is, removed therefrom. This "isaecomp'lis'hed' by my construction,

since; the air within "the chamber '22 is brought to "a" certain pressure by moving the pump cylinder downward thereupon, saidcertain pressure being regulated by the amount that the chamber 22 has previously been withdrawn from the pump cylinder 16,

and the air within the chamber 22 having beenso "c'ompressed--an interval or time is required for its dissipation through the mold and the return to atmospheric pressure Within the chamber; During this vinterval of time'the casting becomes solidified.

I providemeans' for predetermining the maximum pressure to be used by engraving, or otherwise mounting', a scale"upo'n'ithe chamber to indicate such settings" of the chamber within the pump cylinder asj correspend 'to cer'tain' maximum pressures that may be obtained with such setting; In- Figs:

bottom'thereof contacts with thehead' 23',a's- I shown'by dotted'liries 32, the maximum ores sure within'the 'chamber'resulting wil be six; pounds above atmosphere. No greater pressure than siX pounds can';bej obtained within the chamber 22 with this setting of the chamber within the pump cylinder, and thus the maximum pressure upon the-mold is predetermined by such" setting. Furthermore, the olumeogf air within the chamber i 22 'hav'ingbeen brought up to a pressure of six poimc'ls",or"whatever pressure mayhave been predetermined, the' mold will be retained under pressure for such an interval of time as is required for the air'withinthe hamb f22'to 'seep' through themold and thus return the pressure within said cham ber'to atmosphere. "During "this interval of time the casting will have solidified under pressure.

- "A further feature of my" invention is the swinging of the pumpand 'chamber22' away from directl'ypver" the mold, thus "leaving the latter unhou'sed, and in aconvenient p0 sition for'receptio'nof thenietal within, the

crucible portion of the mold, and the appli-' cation of blow torch'to the metal to melt the same. 1" My device maybe" made of any size,"and constructed of any materials deemed convenient and suitable for a device of'this character, and while I have illustrated and described a form of construction and arrangement of parts found desirable in materializing myinvention, I wish to include in this application all mechanical equivalents and substitutes that may fairly be considered to come within the scope and purview of my invention as defined in the appended claims.

Having disclosed my invention so that others may be enabled to construct and to use the same, what I claim as new, and desire to secure by Letters Patent is:

1. In a casting machine to operate a mold: an air pump; and a storage chamber upon the piston of said pump and disposed inter mediate the mold and said air pump.

2. In a casting machine to operate a mold: an air pump; a storage chamber upon the piston of said pump and disposed intermediate said mold and said air pump; and a head upon said chamber adapted to contact with the mold.

3. In a casting machine: a mold receiving base; a standard mounted within said base; an arm rotatably mounted upon said standard; an air pump cylinder mounted upon said arm; a piston within said cylinder; a chamber upon said piston; and a mold engaging head upon said cylinder.

4:. In a casting machine for operatin a mold: an air pump cylinder and a cy indrical storage chamber coaXially and relatively slidably mounted above the mold.

5. In a casting machine for operating a mold: an air pump cylinder slidably mounted above the mold and coaxial therewith; and a storage chamber slidably mounted within said cylinder and adapted to make an airtight connection with the mold.

6. In a casting machine for operating a 7. In a casting machine for operating a mold: a mold receiving base; a pump cylinder; a storage chamber coaXially mounted within said pump cylinder; a head upon said chamber adapted to contact with the mold; a pivotally mounted swinging arm to mount said pump and said chamber above the mold; and positioning means for securing said arm in position wherein said cylinder and said chamber are 'coaxially above the mold.

8. In a casting machine: an air pump cyli inder; a piston within said cylinder; a chamber upon said piston and projecting from one end of said cylinder; and a scale of air pressures upon said chamber.

9. In a casting machine: a co-axially mounted relatively slidable pump cylinder and storage chamber; and a scale to indicate therpressure within said chamber resulting from a certain movement of said cylinder thereupon.

10. In a casting machine: an air pump cylinder, a storage chamber, and a mold engaging head containing a washer, all mount-r ed as a unit; and means to mount said unit upon a mold in a removable manner.

In Witness whereof I claim the foregoing as my own I hereunto affix my signature at Portland, county of Multnomah, State of Oregon, this 16th day of May 1923.

' BURR STRUBLE. 

